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<p>[QUOTE=&quot;joecoincollect, post: 2442904, member: 71338&quot;]I&#039;ve worked with a lot of zinc coins. I&#039;ve run into a lot of higher grade ones with a spot or two of that white/gray light corrosion. First I apply some acetone with a q tip. Usually more is needed to be done though, depending on the level of corrosion. So I&#039;d next use verdicare. This stuff works wonders on zinc coins. I apply it over the obverse for 5-10 minutes, lightly swab it in the trouble area with a q tip, pat it dry, then do the same on the other side. Then I wait a day. The next day I pat excess product off the coin and holder it. The white/gray corrosion spot disappears, the large majority of times.[/QUOTE]</p><p><br /></p>

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